8/12/201514th RHESSI Workshop 1 Dale E. Gary, Center for Solar-Terrestrial Research, Physics...
28
RADIO OBSERVATIONS WITH THE EXPANDED OWENS VALLEY SOLAR ARRAY (EOVSA) 8/12/2015 14th RHESSI Workshop 1 Dale E. Gary, Center for Solar-Terrestrial Research, Physics Department, NJIT
-
Upload
william-marsh -
Category
Documents
-
view
214 -
download
0
Transcript of 8/12/201514th RHESSI Workshop 1 Dale E. Gary, Center for Solar-Terrestrial Research, Physics...
1
RADIO OBSERVATIONS WITH THE EXPANDED OWENS VALLEY SOLAR ARRAY (EOVSA)
8/12/201514th RHESSI Workshop
Dale E. Gary, Center for Solar-Terrestrial Research, Physics Department, NJIT
14th RHESSI Workshop
EXPANDED OWENS VALLEY SOLAR ARRAY
2
8/12/2015
Central array dishes tracking the Sun. EOVSA has 13 such antennas, operating at 2.5-18 GHz.
2.5-18 GHz
400 MHz
~ 40 MHz
14th RHESSI Workshop
3
EOVSA FLARE SIMULATION
8/12/2015
Model images and EOVSA simulation for 16 representative frequencies
Example spectra at several points in the image data cube
Theoretical fit of the spectra to obtain physical parameters, such as this map of magnetic field strength
Gary et al. (2013)
14th RHESSI Workshop
4
A FEW RECENT BURSTS
8/12/2015
14th RHESSI Workshop
5
STAR POINTING (BEFORE)
8/12/2015
14th RHESSI Workshop
6
STAR POINTING (AFTER)
8/12/2015
14th RHESSI Workshop
7
TOTAL POWER CALIBRATION
8/12/2015
Amplitude
Offset
FWHM
Background
14th RHESSI Workshop
8
TOTAL POWER BEAM WIDTH
8/12/2015
14th RHESSI Workshop
9
TOTAL POWER OFFSETS
8/12/2015
14th RHESSI Workshop
10
EVENT COMPARISON WITH NORP
8/12/2015
14th RHESSI Workshop
11
SPECTRAL COMPARISON WITH NORP
8/12/2015
14th RHESSI Workshop
12
INTERESTING FEATURES
8/12/2015
14th RHESSI Workshop
13
2015 JAN 01 EVENT (C1.6)
8/12/2015
14th RHESSI Workshop
14
2015-05-05 X3 FLARE
8/12/2015
14th RHESSI Workshop
15
RADIO/HARD X-RAY LIGHT-CURVES
8/12/2015
14th RHESSI Workshop
16
HARD X-RAY AND RADIO SPECTRA
8/12/2015
14th RHESSI Workshop
17
RHESSI IMAGING (COURTESY EDUARD KONTAR)
8/12/2015
14th RHESSI Workshop
18
2015-06-22 M-CLASS FLARE
8/12/2015
14th RHESSI Workshop
19
TOTAL POWER VS. CORRELATED AMP.
8/12/2015
14th RHESSI Workshop
20
EOVSA ALL-DAY VISIBILITIES
8/12/2015
Baseline 1-2
Baseline 1-3
Baseline 2-3
Baseline 3-4
14th RHESSI Workshop
21
ALL-DAY GOES VS. EOVSA
8/12/2015
C1-level
14th RHESSI Workshop
22
2015-07-08 B0.1 EVENT(!)
8/12/2015
14th RHESSI Workshop
23
GOES DATA FOR 2015-07-08
8/12/2015
14th RHESSI Workshop
24
TOTAL POWER AND RHESSI
8/12/2015
14th RHESSI Workshop
25
CIRCULAR POLARIZATION To convert X, Y linear
polarization to R, L circular, timing is all important.
Different cable lengths for X and Y channels must be carefully compensated.
R = X - iY, L = X + iY
Calculation done digitally
8/12/2015
E
X
Y
14th RHESSI Workshop
26
DATA ON GEOSTATIONARY SATELLITE
8/12/2015
14th RHESSI Workshop
27
BIG DISHES AND CALIBRATION
8/12/2015
Completely refurbished 27-m antennas (controller, motors, cabling, limit switches)
New He-cooled receivers—first one to be installed <insert month here>!
Provides sensitivity to use hundreds of calibration sources and short calibration times.
14th RHESSI Workshop
28
CONCLUSIONS EOVSA is a fantastically capable, solar-dedicated
radio array that is now beginning to obtain science-quality data.
The fundamental challenge of sampling the entire 1-18 GHz radio spectrum at 1-s cadence has been met.
There are several milestones ahead of us to reach the goal of full spectral imaging, but we expect these to come quickly over the next few months.
EOVSA plays the role of a FASR-demonstrator (10% in size and cost), and we expect it demonstrate the exciting science to come with a larger, broader-band, higher-resolution instrument.
8/12/2015
